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L. A. MITCHELL.

WALL AND CEILING 0F BUILDINGS.

No. 318,196. Patented May 19,1885,

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BY ATTORNEYS.

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UNITED STATES PATENT OFFIcE.

LEWIS A. MITCHELL, OF ELIZABETH, NEW JERSEY, ASSIGNOR TO SETH B. RYDER,OF SAME PLACE.

WALL AND CEILING OF BUILDINGS.

SPECIFICATION forming part of Letters Patent No. 318,196, dated May 19,1885.

Application filed December 4, 1884.

To all 1071 am it may concern.-

Be it known that I, Lnwrs A. MIToHELL, of Elizabeth, in the county ofUnion and State of New Jersey, have invented a new and usefulImprovement in Cement Blocks for Walls and Ceilings, of which thefollowing is a full, clear, and exact description.

Thisinvention relates to cement orartificialstone blocks, designed moreespecially for use in the construct-ion of the walls and ceilings ofbuildings; and the invention consists in form ing the blocks withfastening-plates and recesses at the edges, as hereinafter described andclaimed.

Reference is to be had to the accompanying drawings, foriningpart ofthis specification, in which similarletters of reference indicatecorresponding parts in all the figures.

Figure 1 is aperspective view of one of my new cement blocks to beapplied to the studding or beams for forming a wall or ceiling. Fig. 2is a broken front elevation of a wall or ceiling madein accordance withmy invention, showing thejoists or studding, and Fig. 3 is a sectionalelevation of the same taken on the line w a; of Fig. 2. I

A represents the cement blocks, molded, preferably,from awater cementcomposed of fortyfour partsplaster-of-paris, nineteen parts sand,twenty-one partsashes,thirteen parts lime,and three parts ammonia orother similar cement. This or other cement or composition mixture may beused. It is pressed or poured into a suitable mold of a size,preferably, to make the blocks about one and one-quarter inch thick andtwelve by sixteen inches surface, (more or less,) the size beingsuitable for the blocks to go between the beams or studding B, wherethey will be secured by the strips C or other suitable means. At theedges the blocks A are formed with the recesses a,as shown clearly inFigs. 1 and 3. The blocks Abeingsecured (No model to and between thestudding B, the space between the edges of the blocks and over the edgesof the studding will be filled by the cement, plaster, or other materialD, put on with a trowel. This material will fill into the reoess a, asshown at a, Fig. 3, and act to key the blocks to each other and to thestudding, and make them firm and secure. After the material D has beenput in place and has become set the wall is ready for the outerfinishing coat, E, which may be put on with a trowel. the same as withordinary lath-and-plaster walls. The strips C or other fastenings may beof metal, wood, or other suitable material, and are by preference moldedin the blocks A, so as to project at the sides thereof, as shown.

A wall made as described is very firm and cheap, as no lath is requiredand no plaster, save the finishing coat, and there being no wood aboutthe wall it is a great safeguard against and prevents the rapidspreading of fire; also, being thick and heavy, no deafening isrequired, as no ordinary sounds can be heard through it.

The composition described herein forms the subj cot-matter of anotherapplication for a patent of even date herewith.

Having thus described my invention, I claim as new and desire to secureby Letters Patent- 1. As a new article of manufacture, the cement blockA, having fastening-plates C at its edges, and formed with recesses abetween the fastening-plates C, substantially as described.

2. The block A, formed with recesses a at its upper edge and lower edge,and with similar recesses at its side edges, in combination with thefastening-plates C, that pass through the block, substantially asdescribed.

LENVIS A. MITCHELL.

\Vitnesses:

HORACE lVIARSH, CHAUNCEY A. RYDER.

